I'm sorry that I didn't see your question sooner. Our Home Roll should be just what you're looking for. It will display the newest homes added to our search results for a particular area and it's easily added to your website. We offer two versions - the smaller, text-based version, and a larger version with photos. To create yours just click on the link below.
More website tools can be found at http://www.trulia.com/tools/ as well.